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Jets from MRC 0600-399 bent by magnetic fields in the cluster Abell 3376
Nakanishi, Hiroyuki; Akamatsu, Hiroki; Takeuchi, Tsutomu T. +7 more
Galaxy clusters are known to harbour magnetic fields, the nature of which remains unresolved. Intra-cluster magnetic fields can be observed at the density contact discontinuity formed by cool and dense plasma running into hot ambient plasma1,2, and the discontinuity exists3 near the second-brightest galaxy4, MRC 06…
The ASKAP-EMU Early Science Project: 888 MHz radio continuum survey of the Large Magellanic Cloud
Maitra, Chandreyee; Koribalski, Bärbel S.; Norris, Ray P. +28 more
We present an analysis of a new 120 deg2 radio continuum image of the Large Magellanic Cloud (LMC) at 888 MHz with a bandwidth of 288 MHz and beam size of 13${_{.}^{\prime\prime}}$9 × 12${_{.}^{\prime\prime}}$1 from the Australian Square Kilometre Array Pathfinder processed as part of the Evolutionary Map of the Universe survey. The med…
A Planck-selected dusty proto-cluster at z = 2.16 associated with a strong overdensity of massive Hα-emitting galaxies
Koyama, Yusei; Kodama, Tadayuki; Tanaka, Ichi +6 more
We have discovered an overdensity of Hα-emitting galaxies associated with a Planck compact source in the COSMOS field (PHz G237.0+42.5) through narrow-band imaging observations with the Subaru Multi-Object InfraRed Camera and Spectrograph (MOIRCS). This Planck-selected dusty proto-cluster at z = 2.16 has 38 Hα emitters including six spectroscopica…
An Exploration of Model Degeneracies with a Unified Phase Curve Retrieval Analysis: The Light and Dark Sides of WASP-43 b
Waldmann, I. P.; Tinetti, G.; Edwards, B. +2 more
The analysis of exoplanetary atmospheres often relies upon the observation of transit or eclipse events. While very powerful, these snapshots provide mainly one-dimensional information on the planet structure and do not easily allow precise latitude-longitude characterizations. The phase curve technique, which consists of measuring the planet emis…
Uniform Forward-modeling Analysis of Ultracool Dwarfs. II. Atmospheric Properties of 55 Late-T Dwarfs
Line, Michael R.; Marley, Mark S.; Liu, Michael C. +2 more
We present a large uniform forward-modeling analysis for 55 late-T (T7-T9) dwarfs, using low-resolution (R ≈ 50-250) near-infrared (1.0-2.5 µm) spectra and cloudless Sonora-Bobcat model atmospheres. We derive the objects' effective temperatures, surface gravities, metallicities, radii, masses, and bolometric luminosities using our newly deve…
Revisiting the Distance to Radio Loops I and IV Using Gaia and Radio/Optical Polarization Data
Dickinson, C.; Pearson, T. J.; Panopoulou, G. V. +2 more
Galactic synchrotron emission exhibits large angular scale features known as radio spurs and loops. Determining the physical size of these structures is important for understanding the local interstellar structure and for modeling the Galactic magnetic field. However, the distance to these structures is either under debate or entirely unknown. We …
Simultaneous Multiwavelength Flare Observations of EV Lacertae
Hamaguchi, Kenji; Barclay, Thomas; Davenport, James R. A. +17 more
We present the first results of our ongoing project conducting simultaneous multiwavelength observations of flares on nearby active M dwarfs. We acquired data of the nearby dM3.5e star EV Lac using five different observatories: NASA's Transiting Exoplanet Survey Satellite (TESS), NASA's Neil Gehrels Swift Observatory (Swift), NASA's Neutron Interi…
The Atacama Cosmology Telescope: Detection of Millimeter-wave Transient Sources
Hilton, Matt; Choi, Steve K.; Dünner, Rolando +29 more
We report on the serendipitous discovery of three transient millimeter-wave sources using data from the Atacama Cosmology Telescope. The first, detected at R.A. = 273.8138, decl. = -49.4628 at ~50σ total, brightened from less than 5 mJy to at least 1100 mJy at 150 GHz with an unknown rise time shorter than 13 days, during which the increase from 2…
Unveiling the star formation history of the Upper Scorpius association through its kinematics
Gratton, Raffaele; Bonavita, Mariangela; Squicciarini, Vito +1 more
Stellar associations can be discerned as overdensities of sources not only in the physical space but also in the velocity space. The common motion of their members, gradually eroded by the galactic tidal field, is partially reminiscent of the initial kinematic structure. Using recent data from Gaia EDR3, combined with radial velocities from GALAH …
Measuring the density structure of an accretion hot spot
Reynolds, M.; Romanova, M. M.; Calvet, N. +5 more
Magnetospheric accretion models predict that matter from protoplanetary disks accretes onto stars via funnel flows, which follow stellar magnetic field lines and shock on the stellar surfaces1-3, leaving hot spots with density gradients4-6. Previous work has provided observational evidence of varying density in hot spots…